<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allCheck"/>
    </label>
    <span> <span>已完成{{finishNum}}</span> / 全部{{this.todoList.length}} </span>
    <button class="btn btn-danger" @click="deleteFinishHandle">清除已完成任务</button>
  </div>
</template>

<script>
export default {
    name:'Footer',
    props:['allCheckHandle','todoList','deleteFinishHandle'],
    computed:{
        allCheck:{
            get(){
              return this.todoList.every(item => {
                    return item.done
                }) && this.todoList.length !== 0
            },
            set(value){
                this.allCheckHandle(value)
            }
        },
        finishNum(){
          return this.todoList.reduce((p,c) => {
                return c.done ? p+1 : p
            },0)
        }
    }
};
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>